Space and time

Category:Space and time - Wikipedia

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Spacetime Wormholes

The Andromeda paradox: two walkers passing each other disagree about whether a fleet has already launched Light cones: why saying now about Alpha Centauri is a convention and not a fact Michelson and Morley found nothing in 1887 and that null result became physics' most useful measurement The Wheeler-DeWitt equation has no t in it: what the problem of time means for quantum gravity LIGO measured a stretch of space 1/1000 the width of a proton The twin paradox: the traveller really is younger and acceleration is what breaks the symmetry The CPT theorem: reverse time and you must also flip charge and parity The speed of light is not really about light: it is the exchange rate between space and time Two observers disagree about distance and duration but always agree on the spacetime interval Gravity Probe B's gyroscopes and the dragging of spacetime by a rotating Earth The universe is 13.8 billion years old and 93 billion light years wide: how both can be true Why length contraction is a convention about simultaneity and not a physical squash Recombination 380000 years after the Big Bang: how the universe went from opaque to transparent The train and the two lightning strikes: how Einstein's 1905 thought experiment killed absolute simultaneity Interstellar's Miller planet: does one hour near a black hole really cost seven years?

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